#app {
  width: 400px;
  height: 400px;
  position: relative;
  border: 1px solid red;
  margin: 0 auto;
  text-align: center;
}
#app div button {
  position: absolute;
  left: 165px;
}
#app img {
  width: 400px;
  height: 400px;
}
